Control mechanism for scraper bowls



Feb. 21, 1933. c. E. BALL 1,898,163

CONTROL MECHANISM FOR SCRAPER BOWLS Filed June 26, 1931 3 Sheets-Sheet l INVENTOR BY Q QJAL ATTORNQY Feb. 21, 1933. c. E. BALL 1,898,163

CONTROL MECHANISM FOR SCRAPER BOWLS Filed June 26, 1931 3 Sheets-Sheet 2 6 INVENTOR C. EBalL BY a f g ATTORNEY Feb. 21, 1933. c. E. BALL CONTROL MECHANISM FOR SCRAPER BOWLS Filed June 26, 1931 3 Sheets-Sheet 3 INVENTOR the bowl when the latter is raised to a trans- Patented Feb. 21,1933

(irritants a. BALL, or

cmcaeo, rumors, assienon'ro BALL WAGON (manna STOCKTON, cemroama, A CORPORATION GOQZTBOL MECHANISM .FOR SCRAPER BOWLS 1 Application mm June 26,

This invention relates to scrapers, and par:

ticularly 'to scrapers of that character in,

which the bowl is suspended in a wheel supported'frame, and adapted to be up-ended .at its forward end so as to dump from the rear end. The bowl also has a front apron or endgate, normally clear of the bowl whenthe latter is digging, but mounted so as to contact with and close the front of the bowl when the latter has been raised a certain distance. Patent N 0. 1,593,007, dated July 20, 1926; the

resent invention dealing with the means or controlling the vertical movement of the bowl and the engagement of said endgate" therewith. v w I The particular objedt/ot this invention is to so arrange the raising means in connection with the front 'endgate that when the bowl is raised from its digging position, it will first be pulled into positive engagement with theendgate, and said gate and bowl will then be raised as a unit while being held rigidly together.

The endgate is always held close against porting position, so that no dirt will ever be lost by spilling between the bowl .and the endgate during transportation, as was the case with the previous structure, in which the endgate wasmerely held against the dirt by its own Weight and that of the dirt engaged thereby, an was otherwise free to move relative to the bond with the vibration and jarring incident to the movement of the apparatus I from one point to another.-

such structure and relative arrangement of parts-as will fully appear by'a perusal ofthe "fol1owing specification and claims.

A furthes object of the inventionis to produce a simple and inexpensive device and yet one which will be exceedingly effective.

.for the purpose for which it is designed.

These objects d accomplish by means of In the drawings similar characters of reference indicate corresponding. parts n the several views Fig. .1 is a. side'elevation of a scraper bowl as mounted in connection with the supporting and control mechanismand in a digging po- Such an apparatus is shown in vent the 1931. Serial No, 546,985.

sition, the near frame members being removed,

Fig. 2 is asectional elevation of the bowl showing the same raised to fully engage the endgate.

Fig. 3 is a similar view showing the bowl raised to a dumping position.

Fig. 4 is a fragmentary sectional plan of the structure abovethe bowl, taken on the liue4.4 of 2. q

Referring now more particularly to the characters of reference on the drawings, the scraper structure comprises a main frame-1 of suitable character "supported by wheels or endless track's'2. The bowl 3 of the scraper tracks, and is preferably of the term and 65 I is disposed in the .frame rearward'ly'of the construction shown in my co-pending a plii cation for patent, Serial'No. 547,306 filed],-

June 27, 1931. Arranged in connection with the bowl at the front 'is an endgatecoinprismg a transversely vertically extending plate 4 having rearwardly projecting side wings 5. This plate is curved to conform'to the curvature'of the forward edges of thesides of the bowl, the side wings fitting therebetween. The rear lower edge of the late, when the gateis fully engaged with the owl, abuts agalnst the forward edge of the cross bar 6 which issecured on the bottom plate of the bowl and which supports the forwardly projecting blade Ltherebelow, as

shown in Fig. 2. V 3

Rigidwith the, wings and projecting rear wardly therefrom are. arms 8 which are pivoted at their rear ends on the sides of the bowl. The endgate is normally suspended from chains 9 or the like which depend from and are secured to the frame, and which pre dgate drop Eng below a certain .levelwithout interfering with its upward movement. I

The bowl is supported from the frame substantially-horizontal side arms 10. These arms are pivoted at their rear endson brackets 11 secured to the outside of the bowl inter'- mediate its front and rear ends and toward the bottom, and at theirforward'ends on' the frame ahead of the bowl. 'Sus ensionarms' 12 depend from pivotal connections with the .1 I

frame above the bowl to similar Connections withthe sides of the bowl at'its rear end and near the bottom, said arms normally having a forward slope toward'their upper end.

Mounted on the frame above the points of connection of the arms; 12 therewith are transversely spaced drums 13, which are rotated at the option of the operator by any suitable mechanism which forms no part of this invention. Cables 14 are wound on and depend from these drums, passing between the arms 10 and the sides of the bowl and about guarded sheaves 15 mounted on the bowl ahead of the brackets 11. The cables after passin about the sheaves extend upwardly to Xed connections with the forward face of the endgate plate 4 intermediate its top andbottom, and preferably at points close to the points of connection of the chains 9 therewith. While I have described the structure as having a pair of cables, in practice I preferably only use one such cable, th s cable passing unbroken from one drum to and about its sheave, up to the endgate and then across the forward face of the endgate from side to side and thence to the other sheave and drum. This cable is held from slipping relative to therendgate by passing cause the about grooved cradles 16. disposed at the corners of the endgate, as shown in Fig. 4. By reason of this arrangement it will be seen that when the chains 9 are taut' and the endgate' is in its normal suspended position, said chains and cable together serveas the means to hold the bowl in a definite position,

out of the cable on the drums will bowl to be lowered without affecting the level of the endgate. When the cable is wound on its drum to raise thebowl from and payin its diggingposition, the front end ofthe" bowl will be raised toward the endgate, while at the same time said gate will be positively held at its limit of downward movement by the pull of the cable. As the bowl -is thus raised, the endgate gradually assumesv its proper and predetermined bowl engaging Iposition, on account of the pivoted arms 8 which confine the movement of the endgate to a definite are relative to the bowl. .With

this relative movement between the front of the bowl andthe endgate, the lowerbdge of the latter cuts through any dirtin its path e the same in the bowl.

and positively confines the dirt rearwardly of After the lower edge "ofthe endgate en'- gages the cross bar 6, it can of course move no further down. With any further upward movement of the bowl ther'eforefthe ends of the cable, anchored on the endgate cause the bowl and endgate to be raised as a unit, and

7 the chains 9 become slack. In other words,

as far as the raising of the bowlis concerned,

' said cable ends could then be anchored on the .bowl itself. By having them connected to the endsrate instead however, not only are 'further raising of the fsuspending ing about the sheaves a front gate for the bowl, means normally suspending the gate from the frame in P0- the endgate and bowl positively brought into engagement with each other, heldengaged with equal ressure with any owl. Since the weight of the bowl tends to cause-the same to drop at its front end, the endgate and bowl are always maintained in this close and posibut they are tive engagement with each other when the bowl is raised to its-transporting position and the drums are held against rotation.

From the foregoing description it w1ll be invention as set forth herei' While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as donot form a departure from the spirit of the invention, as defined by the appended claims.

Having thus described my invention what I claim as new and useful and desire to secure by Letters Patent is:

readily seen that I have producedsuch a device as substantially fulfills the ob ects of the 1. In a scraper, a frame supported from the ground, a bowl, means suspending the bowl in the frame for upward tilting at its front end, a front gate for the bowl, means suspending it hangs above the front end of the bowl when the latter is-in a scraping posztion,

pull on the gate ,while tilting the bowl upwardly and so as to bring the gate and bowl into positive engagement with each other.

2. In a scraper, 'a frame supported from the gate from the frame so that and a common means exerting a downward the ground, a bowl, means suspending the- 3. A structure as in claim 1, with means I pivotally connecting the gate in connection with the bowl for positive movement into and out of place relative to the front end of the bowl. I

, 4. A structure as in claim 2, with means pivotally connecting the gate in connection withthe bowl for positive movement into and out of place relative to the front end of the bowl; and means to positively limit the downward movement of the gate relative to the bowl.

5. Ina scraper, a frame supported from L the ground, abowl suspended from the frame for upward tiltlng movement at its front end,

sition above the front of the bowl when the latter is in a scraping position, means between the frame and gate to exert a down-,

ward pull on the latter, and means between the bowl and said first named means to tilt the bowl upwardly with such pull.

- 6. In a scraper, a frame supported from the ground, a bowl suspended from the frame for upward tilting movement at its front end, a front gate for the bowl, means normally suspending the gate from the frame in position above the front of the bowl when the latter is in. a scraping position, means v between the frame and gate to exert-a downward pull on the latter, means between the bowl and said first named means to tilt the bowl upwardly with such pull whereby the bowl will ultimately engage and be held against the gate; the gate suspending means beingv flexible to cause a continuation of the pull, after the bowl and gate have thus engage-d, to raise said bowl and gate as a unit.

'7. In a scraper, a frame supported from the L -round, a bowl suspended from the frame for upward tilting movement at its front end,

a front gate for the bowl, means normally suspending the gate from the frame in pos tion above the front of the bowl when the latter is in a scraping position, and a bowl tilting element, and means'connecting said element to the bowl and gate in such relationship that the lower edge of the gate,v after the bowl has been tilted a predetermined distance, will engage'the cooperating surface of the bowl with a pressure pro ortionate to' the weight of the bowl an its I load.

In testimony whereof I aflix my signature.

CHARLES BALL. 

